Selection of Suitable Parents in the Development of Potato Hybrids in Bangladesh     

M K Biswas　M A A Mondal　M Hossain　R Islam 《中国马铃薯》2005,19(4):193-197

Potatoes(Solanum tuberosum L)are the thirdlargest food crop in Bangladesh following rice andwheat and make a major contribution to the total foodsupply of the country.Although in many westerncountries potato is the number one staple food,it is al-most entirely used as a vegetable in Bangladesh.Thepotato is a short duration crop that produces a largeamount of calories in a short period of time[1].Thepotato produces more protein and calories per unitarea per unit time than any other major food…  相似文献   

Prospects and challenges in utilization of indigenous rocks and minerals as source of potassium in farming     

Abhay Omprakash Shirale  Bharat Prakash Meena  Priya Pandurang Gurav  Sanjay Srivastava  Ashis Kumar Biswas  Jyoti Kumar Thakur 《Journal of plant nutrition》2013,36(19):2682-2701

Potassium (K) is one of the essential nutrients required by crops in large quantities; however, its use in agriculture by farmers is less than required in developing countries. This neglect has led to excess mining of K in soils by crop plants and has resulted in a negative balance of K in soils. This loss necessitates the need of more use of potassium fertilizers in agriculture. Rocks and minerals offer a potential fertilizer to utilize in agriculture as source of K. The crop trials revealed that feldspar, mica, glauconite, nepheline and shoenite are good sources of K for crops, especially in highly weathered acid soils. However, some researchers have reported no agronomic benefit of feldspar or granite rock application to crops. Overall the size modification, acidulation, microbial inoculants and preparation of K-enriched compost are the effective techniques to utilize K-bearing rocks and minerals. Very limited information is available on these aspects. Thus, in this review, an attempt has been to consolidate up-to-date information of indigenous rocks and minerals as possibilities for alternate sources of K for crop plants. Moreover, this area of research needs attention to utilize indigenous K sources, which can aid to limit the import and cost, of the establishment of potash fertilizer-based industries in developing countries.  相似文献   

Physical and mechanical properties of jute, bamboo and coir natural fiber     

Subhankar Biswas  Qumrul Ahsan  Ahmed Cenna  Mahbub Hasan  Azman Hassan 《Fibers and Polymers》2013,14(10):1762-1767

A systematic study has been carried out to investigate the mechanical and physical properties of jute, bamboo and coir (brown and white) single fibers. The tensile properties (tensile strength, Young’s modulus and strain to failure) were determined by varying span length. Scanning electron microscopic analysis was also carried out to determine the physical properties of fibers in order to correlate with its strength, Young’s modulus and strain to failure. The Young’s modulus and strain to failure were corrected using newly developed equations. The study revealed that with increasing test span length the Young’s modulus increased and tensile strength as well as strain to failure decreased. This is because no extensometer could be used in this test set-up and machine displacement (denoted by α) was used for the modulus determination. It is also attributed that larger span length helps to minimize the machine displacement compared to smaller ones due to the reduced relative effect of slippage in the clamps. Among all fibers, the Young’s modulus of bamboo fiber was the highest. Jute fiber had smoother surface compared to other three examined fibers.  相似文献   

Using acellular aortic matrix to repair umbilical hernias of calves     

V Kumar  N Kumar  AK Gangwar  AC Saxena 《Australian veterinary journal》2013,91(6):251-253

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Evaluation of cotton byproducts as fillers for poly(lactic acid) and low density polyethylene     

N. SutivisedsakH.N. Cheng  M.K. DowdG.W. Selling  A. Biswas 《Industrial Crops and Products》2012,36(1):127-134

Polymeric composites based on cotton burr and cottonseed bull have been prepared by melt blending and extrusion. For poly(lactic acid) (PLA) and low-density polyethylene (LDPE), addition of the fillers slightly changed the composite's thermal properties but significantly decreased the composite's mechanical properties. Heat treatment prior to extrusion resulted in composites with better tensile strength and Young's modulus. The use of maleic anhydride and peroxide only slightly improved the physical properties of the LDPE materials, but the effect was less clear for the PLA materials. The PLA-filler composites may be useful for lowering the cost of the materials in applications that can tolerate the decreased properties. In addition, the addition of fillers to LDPE might be beneficial in applications to improve stiffness or to improve biodegradability.  相似文献   

Total Phenolics and Antioxidant Activity of Water and Ethanolic Extracts from Distillers Dried Grains with Solubles With or Without Microwave Irradiation     

George E. Inglett  Devin J. Rose  David G. Stevenson  Diejun Chen  Atanu Biswas 《Cereal Chemistry》2009,86(6):661-664

The purpose of this study was to determine the efficacy of extracting phenolic compounds with antioxidant activity from distillers' dried grains with solubles (DDGS) with water, 50% aqueous ethanol, and absolute ethanol, using microwave irradiation or a water bath at various temperatures. DDGS was extracted for 15 min with each solvent while heating at 23, 50, 100, and 150°C by microwave irradiation or in a water bath at 23, 50, and 100°C. Phenolic content of extracts increased with increasing temperature to a maximum of 12.02 mg/g in DDGS extracts that were microwave irradiated in water or with 50% aqueous ethanol at 150°C. Antioxidant activity range was 1.49–6.53 μmol of Trolox equivalents/g of DDGS. Highest antioxidant activities were obtained from 50% aqueous ethanol extracts at all temperatures, and water extracts that were heated at 100 and 150°C. These data indicate that DDGS extracts with high phenolic content and antioxidant activity can be obtained from DDGS, particularly with the use of water or 50% ethanol and high temperature (100 or 150°C). This may be valuable to ethanol manufacturers, livestock producers, and food and nutraceutical companies.  相似文献   

Effects of carbohydrate supplementation on water quality,microbial dynamics and growth performance of giant tiger prawn (Penaeus monodon)     

Sujeet Kumar  P. S. Shyne Anand  D. De  J. K. Sundaray  R. Ananda Raja  G. Biswas  A. G. Ponniah  T. K. Ghoshal  A. D. Deo  A. Panigrahi  M. Muralidhar 《Aquaculture International》2014,22(2):901-912

Biofloc technology based 45-day indoor growth trial was conducted to evaluate the effect of carbohydrate (CHO), molasses supplementation on two developmental stages viz, juvenile (J) and sub-adult (SA) of Penaeus monodon in zero-water exchange system. P. monodon juveniles (1.56 ± 0.04 g) and sub-adults (14.32 ± 0.22 g) were stocked in fibre-reinforced plastic tanks (1,000 L) with soil base. Carbohydrate supplementation significantly reduced (p < 0.05) the total ammonia nitrogen (TAN), nitrite-N (NO₂-N) and nitrate-N (NO₃-N) over the time periods in sub-adult group. However, no significant difference in TAN and NO₂-N was observed in juvenile-based treatments. Supplementation of carbohydrate significantly increased (p < 0.05) the water and soil total heterotrophic bacterial (THB) count in both juvenile and sub-adults. Despite increase in total Vibrio count (TVC), lower TVC/THB % was noticed in the water column of J + CHO (0.82) and SA + CHO (0.73) compared to control groups, J ? CHO (1.48) and SA ? CHO (1.21). Supplementation of carbohydrate increased the final body weight in J + CHO (6.51 ± 0.44 g) and SA + CHO (22.52 ± 0.98 g) compared with respective controls, J ? CHO (5.05 ± 0.45 g) and SA ? CHO (20.00 ± 0.33 g). Similarly, significantly lower (p < 0.05) feed conversion ratio and better protein efficiency ratio were recorded in carbohydrate-supplemented juvenile and sub-adults treatment groups. The present study demonstrates that supplementation of carbohydrate reduced the nitrogenous metabolites and significantly enhanced the growth performance of juvenile and sub-adult of P. monodon.  相似文献   

In planta detection of Macrophomina phaseolina from jute (Corchorus olitorius) by a sodium acetate-based direct PCR method     

Chinmay Biswas  Piyali Dey  Kunal Mandal  Subrata Satpathy  P. G. Karmakar 《Phytoparasitica》2014,42(5):673-676

Macrophomina phaseolina (Tassi) Goid. is the most important pathogen of jute and primarily causes seedling blight, leaf spot and stem rot. The pathogen was detected from field samples by a simple method of direct PCR (dPCR) which obviates the steps of DNA extraction. The leaf bits were treated with a lysis buffer at 65°C for 25 min, whereas the stem pieces were initially incubated at 65°C for 5 min followed by incubation at 60°C for 25 min and the lysate was used as PCR template. Based on the type of tissue, the composition and concentration of lysis buffer systems were optimized. For leaf samples the optimized buffer system composed of 20 mmol l ^-1 tris (hydroxymethyl aminomethane (Tris)-Cl (pH 8.0), 1.5 mmol l ^-1 ethylene diamine tetra acetate (EDTA) (pH 8.0), 1.4 mol l ^-1 sodium acetate and 200 μg/ml proteinase K. Further, 3% PVP (w/v) and β-mercaptoethanol (1% w/v) were added into the buffer. In case of stem samples, PVP was not applied and higher concentrations were used for other components. M. phaseolina could be detected from both leaf and stem samples generating amplicon of 350 bp. This is the first report of detecting M. phaseolina by a direct PCR method without DNA extraction.  相似文献   

Effect of cytolethal distending toxin of Campylobacter jejuni on adhesion and internalization in cultured cells and in colonization of the chicken gut     

Biswas D  Fernando U  Reiman C  Willson P  Potter A  Allan B 《Avian diseases》2006,50(4):586-593

Campylobacter jejuni produces cytolethal distending toxin (CDT) that causes host cells to arrest during their cell cycle and that is involved in the pathogenesis of inflammatory diarrhea in humans. To assess the role of CDT in adherence and invasion of different cultured host cells (HeLa and HD-11) and in colonization of the chicken intestine, the genes of C jejuni NCTC11168 encoding the toxin subunits (cdtA, cdtB, and cdtC) were inactivated by insertional mutagenesis. No significant difference was found in adhesion of the wild-type C. jejuni and the isogenic mutants to HeLa and HD-11 cells. All of the mutants exhibited a decrease (>10-fold) in the ability to invade HeLa cells, but no significant difference was noticed for HD-11 cells. The ability of mutants to colonize birds either directly or by horizontal transfer was unchanged. These data indicated that although the production of cytotoxin does not play a role in the adherence to either human or avian cells, it may play a role in the invasion, survival, or both of C. jejuni in human cells, which are more susceptible to C. jejuni internalization. The CDT also does not seem to play a role in the colonization of poultry.  相似文献   

Nitrogen transformation and carbon sequestration in wetland paddy field of Bangladesh     

Alam  Md. Ashraful  Rahman  Md. Mizanur  Biswas  Jatish Chandra  Akhter  Sohela  Maniruzzaman  M.  Choudhury  Apurba Kanti  Jahan  M. Abu Hena Sorwar  Miah  Md. Main Uddin  Sen  Ranjit  Kamal  M. Zia Uddin  Mannan  Md. Abdul  Shiragi  Humayun Kabir  Kabir  Wais  Kalra  Naveen 《Paddy and Water Environment》2019,17(4):677-688

Paddy and Water Environment - Rice-based cropping systems in Bangladesh have received little consideration of changing nitrogen (N) and carbon (C) in soil. Therefore, this study was conducted at...  相似文献